Pineapple Grapefruit Swirl

Ingredients

2 tequila

1 ¼ cups canned unsweetened pineapple juice

1 ¼ cups fresh pink grapefruit juice

Sugar

Stir together 1 cup of the grapefruit juice and sugar, if desired, until sugar is dissolved. Pour into an ice tray and freeze into solid cubes. In another ice tray, pour 1 cup of the pineapple juice and freeze into solid cubes. The fruit mixtures may be prepared up to this point 1 day in advance....